“The patient in question had reported being in an area of the Congo on a medical missionary trip, but he was in a location where the Ebola outbreak had been officially declared over, with no cases reported for 45 days, according to the CDC."

Officials said normal operations were resumed at the hospital by the late afternoon and there is no threat or concern for patient, staff or visitor safety.

The deadly Ebola virus disease is a serious illness that originated in Africa, where a large outbreak occurred between 2014 and 2016.

KILLER VIRUS: What is Ebola?

The Ebola virus, also known as Ebola virus disease - previously called Ebola haemorrhagic fever - is a disease that occurs in humans and primates.

The virus is part of the Filoviridae family, which also includes Marburg virus.

To date, scientists have identified five strains of Ebola - four of which are known to cause disease in humans.

The natural reservoir - or host of the virus - is thought to be the fruit bat.

Non-human primates are a secondary host, and like humans develop fatal symptoms, so are unlikely to be the reservoir.

In spite of the epidemic that swept West Africa from 2013 to 2015, scientists class Ebola as a virus that has a relatively low infection rate.

During that, the most recent and most widespread outbreak, one Ebola patient would typically pass the disease on to another two people.

That is compared with a disease like measles where one case can often lead to 18 new infections.

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It's only known to be spread through direct contact with bodily fluids and causes fevers, headaches, diarrhoea, vomiting, stomach pain and unexplained bleeding or bruising.

The last significant outbreak, which killed 33 people in the Congo, was declared over on Tuesday after aspeedy international response that apparently contained its spread to remote rural areas.

There has been no Ebola cases in the US.

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